The December 2015 My Oracle Support Release added Customer User Administrator (CUA) functionality to the Oracle Cloud Support portal. The change makes it much easier for customers using the Cloud Portal (including many Oracle MICROS and Oracle Hospitality customers) to manage user access and Support Identifier (SI) tasks.
If you are a CUA, you will be notified of current administrative tasks in the notification area in the top area of the Cloud Portal page. You can also click your name, then the Administration sub-link, and you'll be taken to the CUA information view in the Cloud Portal.
Review the video found in "Cloud Support Portal - How to Use the CUA Functionality" (Document 2072499.1).
You can also review existing trainings on how to perform common CUA tasks by visiting "Customer User Administrator (CUA) Roles and Responsibilities" (Document 1544004.2).
The Cloud Portal allows you to verify user approval actions and review Support Identifier notices. However, Cloud Portal does not fully support managing Support Identifier assignments and renewals. To perform these actions you will need to continue using the standard My Oracle Support portal for the time being. Review the video training linked above for more details.